PHP获取父对象'；s ID=>；儿童'；s值作为XML中的数组

我有一个这样结构的XML文件

<serieslist>
    <series sid="123">
        <title type="main">Series 123 Main Title</title>
        <title type="official">Series 123 Official Title</title>
        <title type="short">S 123</title>
    </series>
    <series sid="456">
        <title type="main">Series 456 Main Title</title>
        <title type="official">Series 456 Official Title</title>
        <title type="short">S 456</title>
    </series>
    /* +6000 more <series> nodes */
</serieslist>

array(
    123 => "Series 123 Main Title",
    456 => "Series 456 Main Title",
    //...
);

我尝试使用这个xpath查询

//series/title[@type=“main”]

，得到了节点列表

$xml = DOMDocument::load('serieslist.xml');
$xpath = new DOMXPath($xml);
$titles = $xpath->query('//series/title[@type="main"]');
$series = array();
foreach($titles as $title) {
    $series[] = $title->nodeValue;
}

导致

$series = array(
    0 => "Series 123 Main Title",
    1 => "Series 456 Main Title",
    //...
);

---

但我也需要家长的“sid”属性。我如何以非资源密集型的方式做到这一点？

非常简单。只需参考

$title

：

foreach($titles as $title) {
    $id = $title->parentNode->getAttribute('sid');
    $series[$id] = $title->nodeValue;
}

---

很简单。只需参考

$title

：

foreach($titles as $title) {
    $id = $title->parentNode->getAttribute('sid');
    $series[$id] = $title->nodeValue;
}

---

我一定要多学习DOMDocument文档，非常感谢。我一定要多学习DOMDocument文档，非常感谢。